Johan fetter johansson



(No Model.)

I I I I l I I I I I I; 1 I I I 1 I I I I I 1 I Patented Oct. 15,1895.

J. P. JOHANSSON. ADJUSTABLE STROKE CRANK.

winwsses.

ANDREW EGRANM.PHDTOUTKQWISNINBTONDI .e'rsrrr t me,

J OHAN PETTER J OHANSSON, OF ENKJUPING, ASSIGNOR TO B. A. HJORTI'I & 00., OF STOCKHOLM, SWEDEN.

ADJ USTABLE=STROKE CRAN K.

SPECIFICATION forming part of Letters i atent No. 547,853, dated October 15, 1895.

' Application filed June 21,1895- Serial No. 553,585- (No model.)

To all whom it may concern:

Be it known that I, J oriAn PETTER J OHANS- soN, a subject of the King of Sweden and Norway, and a resident of Enkjdping, Sweden, have invented an Improved Adj ustable- Stroke Crank,'of which the following is a known means (not needing to be shown) and' provided at one end with a crank-pin b, located obliquely in such a manner that its geometrical axis will describe a conical surface as the driving-shaft revolves. The crank-pin may be attached either eccentrically to the end of the driving-shaft a, so as to converge to the axis of the latter, as shown in the drawings, or conversely it may be attached to the central portion of the end of the drivingshaft, diverging from its axis. On the crankpin b a spherical bearing 0 is arranged in which the crank-pin can be shifted longitudinally, said spherical bearing forming at the same time a gudgeon, which fits into a correspondingly-shaped socket in the end of the connecting-rod d. This rod is guided laterally by the driving-shaft box f, into which it enters through a recess 6, so that the connectingrod, with its ball-bearing, cannot be shifted in the direction of the axis of the drivingshaft. The outer end of the crank-pin 1) may of course be free; but for the sake of rigidity it is advisable to attach it to the end of a journaled pin g, whose axis forms a prolongation of that of the driving-shaft a.

When the driving-shaft is shifted longitudinally in its box f, and V which shifting may be done by hand or by any kind of simple or well-known means, such as shown, but which means do not constitute part of my invention or claims, the crank-pin will cause the ball gudgeon c, which cannot move in the same direction as the shaft, to move from or approach the axis of the driving-shaft, and consequently as the latter rotates the center of the connecting-rod end will describe cir-. 5 5 cles of greater or less diameter, according to the position of the ball on the crank-pin, or,

in other words, the stroke of the connectingrod will vary.

By the means described above very slight 6o alterations in the length of the stroke can be made, since the variation in the latter depends directly on the motion of the drivingshaft axially, and this motion may be made very small.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. An improved means for varying the length of stroke of reciprocating parts of machinery, consisting of the combination of the following devices, namely, a shaft box, a driving shaft free to be shifted lengthwise, a crank pin at one end of such shaft and placed at an incline relatively to the axis of the shaft, a ball gudgeon in which this pin can be shifted longitudinally, a connecting rod for the reciprocating part of a machine and having an end socket in which the ball gudgeon fits, said shaft-box having a guide recess to prevent shifting of this connecting rod in the direction of the axis of the shaft, the combination being and operating substantially as and for the purposes set forth.

. 2. In combination, the shaft a, its shaft-box in which it may be shifted endwise and having a recess e, oblique pin b, gudgeon 0, rod d, and pin g, all substantially as and for the purposes set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Witnesses:

H. TELANDER, T. RISBERG. 

